Concept:A sensitive period is a specific time frame in development when an organism is especially receptive to learning a particular skill or trait. During this window, acquisition happens most rapidly and efficiently.
Explanation:Development occurs in stages like infancy, early childhood, and adolescence. The sensitive period typically spans from birth to about 5 years. In this phase, the child’s brain is highly plastic, so skills like language, attachment, or motor abilities are picked up quickly. Favourable experiences during this time boost growth, whereas unfavourable conditions can lead to lasting delays or damage. Unlike the zone of proximal development (which requires guidance from a more knowledgeable person), the sensitive period is purely about the organism’s internal readiness. Developmental delay refers to falling behind age‑appropriate milestones, not a period of rapid acquisition. Cognitive stagnation means a halt in thinking abilities, which is unrelated. Hence, the term that matches the description of rapid skill acquisition is the sensitive period.
Answer:Option A – sensitive period